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This paper investigates an acoustic prism for continuous acoustic beamsteering by a simple frequency sweep. This idea takes advantages of acousticwave velocity shifting in metamaterials in the vicinity of local resonance. Weapply this concept into the piezoelectric metamaterial consisting of hostmedium and piezoelectric LC shunt. Theoretical modeling and FEM simulations arecarried out. It is shown that the phase velocity of acoustic wave changesdramatically in the vicinity of local resonance. The directions of acousticwave can be adjusted continuously between 2 to 16 degrees by a simple sweep ofthe excitation frequency. Such an electro-mechanical coupling system has afeature of adjusting local resonance without altering the mechanical part ofthe system.

Acoustic Prism for Continuous Beam Steering Based on Piezoelectric Metamaterial